The Law of Cosines: What is this about?
A Mathematical Droodle
|What if applet does not run?|
The applet could serve to demonstrate the Law of Cosines and also the fact that the centers of the squares constructed (externally) on the sides of a parallelogram form a square, which is known as one of V. Thebault's theorems.
- R. Nelsen, Proofs Without Words, MAA, 1993, p. 19
Copyright © 1996-2018 Alexander Bogomolny